"A man came, one sent from God, and his name was John. He came as a witness, to testify about the Light, so that all might believe through him. He was not the Light, but he came to testify about the Light: 

This was the true Light that, coming into the world, enlightens every person. He was in the world, and the world came into being through Him, and yet the world did not know Him. He came to His own, and His own people did not accept Him. But as many as received Him, to them He gave the right to become children of God, to those who believe in His name, who were born, not of blood, nor of the will of the flesh, nor of the will of a man, but of God. And the Word became flesh, and dwelt among us; and we saw His glory, glory as of the only Son from the Father, full of grace and truth."

(Joh 1:6-14)

Here we see John explaining the theology of John's preaching. This is an introductory course to the Pharisees and other cognoscenti that the world, as they imagined it, was about to be broached by the revelation of one who is not just flesh and blood, but from the spirit world they have minimized.At the time of Yeshua, Judaism had broken into sects, Pharisees and Sadducees on the religious side, along with the Greeks who were ":secular" and the Romans were-- well-- Romans!